1/*-
2 * Copyright (c) 2014 Andrew Turner
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28#include <sys/param.h>
29#include <sys/systm.h>
30#include <sys/conf.h>
31#include <sys/malloc.h>
32#include <sys/memrange.h>
33#include <sys/uio.h>
34
35#include <machine/memdev.h>
36#include <machine/vmparam.h>
37
38#include <vm/vm.h>
39#include <vm/pmap.h>
40#include <vm/vm_extern.h>
41#include <vm/vm_page.h>
42
43struct mem_range_softc mem_range_softc;
44
45int
46memrw(struct cdev *dev, struct uio *uio, int flags)
47{
48	struct iovec *iov;
49	struct vm_page m;
50	vm_page_t marr;
51	vm_offset_t off, v;
52	vm_prot_t prot;
53	u_int cnt;
54	int error;
55
56	error = 0;
57
58	while (uio->uio_resid > 0 && error == 0) {
59		iov = uio->uio_iov;
60		if (iov->iov_len == 0) {
61			uio->uio_iov++;
62			uio->uio_iovcnt--;
63			if (uio->uio_iovcnt < 0)
64				panic("memrw");
65			continue;
66		}
67
68		v = uio->uio_offset;
69		off = v & PAGE_MASK;
70		cnt = ulmin(iov->iov_len, PAGE_SIZE - (u_int)off);
71		if (cnt == 0)
72			continue;
73
74		switch(dev2unit(dev)) {
75		case CDEV_MINOR_KMEM:
76			/* If the address is in the DMAP just copy it */
77			if (VIRT_IN_DMAP(v)) {
78				error = uiomove((void *)v, cnt, uio);
79				break;
80			}
81
82			switch (uio->uio_rw) {
83			case UIO_READ:
84				prot = VM_PROT_READ;
85				break;
86			case UIO_WRITE:
87				prot = VM_PROT_WRITE;
88				break;
89			}
90
91			if (!kernacc((void *)v, cnt, prot)) {
92				error = EFAULT;
93				break;
94			}
95
96			/* Get the physical address to read */
97			v = pmap_extract(kernel_pmap, v);
98			if (v == 0) {
99				error = EFAULT;
100				break;
101			}
102
103			/* FALLTHROUGH */
104		case CDEV_MINOR_MEM:
105			/* If within the DMAP use this to copy from */
106			if (PHYS_IN_DMAP(v)) {
107				v = PHYS_TO_DMAP(v);
108				error = uiomove((void *)v, cnt, uio);
109				break;
110			}
111
112			/* Have uiomove_fromphys handle the data */
113			m.phys_addr = trunc_page(v);
114			marr = &m;
115			uiomove_fromphys(&marr, off, cnt, uio);
116			break;
117		}
118	}
119
120	return (error);
121}
122
123/*
124 * allow user processes to MMAP some memory sections
125 * instead of going through read/write
126 */
127/* ARGSUSED */
128int
129memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
130    int prot __unused, vm_memattr_t *memattr __unused)
131{
132	if (dev2unit(dev) == CDEV_MINOR_MEM) {
133		*paddr = offset;
134		return (0);
135	}
136	return (-1);
137}
138
139int
140memioctl_md(struct cdev *dev __unused, u_long cmd __unused,
141    caddr_t data __unused, int flags __unused, struct thread *td __unused)
142{
143	return (ENOTTY);
144}
145